CUET · PHYSICS · PYQ PAPER 2023
Which of the following statements best describe the temperature dependence of resistances of Cu and Si in the temperature range 27° to 127°C.
- A Linear decrease for both Cu and Si
- B Linear increase for both Cu and Si
- C Linear decrease for Cu and exponential increase for Si
- D Linear increase for Cu and exponential decrease for Si
Answer & Solution
Correct Answer
(D) Linear increase for Cu and exponential decrease for Si
Step-by-step Solution
Detailed explanation
Copper (Cu): As a metal, its resistance increases linearly with temperature because rising heat causes lattice ions to vibrate more, hindering the flow of electrons. Silicon (Si): As a semiconductor, its resistance decreases exponentially because heat provides enough energy to…
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